Kaon tagging at 0° scattering angle for high-resolution decay-pion spectroscopy

Anselm Esser, Patrick Achenbach, Naoki Arai, Carlos Ayerbe Gayoso, Ralph Böhm, Olga Borodina, Damir Bosnar, Vakkas Bozkurt, Luka Debenjak, Michael O. Distler, Ivica Friščić, Yu Fujii, Toshiyuki Gogami, Mar Gómez Rodríguez, Osamu Hashimoto, Satoshi Hirose, Hiroki Kanda, Masashi Kaneta, Eunhee Kim, Junichiro KusakaKazushige Maeda, Amur Margaryan, Harald Merkel, Ulrich Müller, Sho Nagao, Satoshi Nakamura, Josef Pochodzalla, Christophe Rappold, Joerg Reinhold, Takehiko R. Saito, Alicia Sanchez Lorente, Salvador Sánchez Majos, Björn Sören Schlimme, Matthias Schoth, Florian Schulz, Concettina Sfienti, Simon Širca, Liguang Tang, Michaela Thiel, Kyo Tsukada

Research output: Contribution to journalConference articlepeer-review


At the Mainz Microtron hypernuclei can be studied by (e,e'K) reactions. By detecting the kaon which is emitted in forward direction, with the KAOS spectrometer placed at 0° scattering angle, reactions involving open strangeness production are tagged. High-resolution magnetic spectrometers are then used to coincidentally detect the monoenergetic decay-pions from mesonic two-body weak decays of light hypernuclei at rest. As a pioneering experiment has confirmed, the KAOS spectrometer is exposed to a large flux of background particles, mostly positrons from bremsstrahlung pair production. In order to increase the effciency of kaon identification the KAOS spectrometer was modified to suppress background particles at the cost of a high momentum resolution, which is less important for this experiment. This was achieved by placing up to 14 cm of lead absorbers in front of the detectors, in which positrons are blocked by forming electromagnetic showers while the effect on kaons is limited. An additional time-of-flight wall and a new threshold Čerenkov detector help to increase the detection effciency of kaons.

Original languageEnglish
Article number11011
JournalEPJ Web of Conferences
Publication statusPublished - 2014
Event2013 International Nuclear Physics Conference, INPC 2013 - Firenze, Italy
Duration: 2013 Jun 22013 Jun 7

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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